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/*
Calling Sequence
[Pxx, freq] = cohere(x,y,Nfft,Fs,window,overlap,range,plot_type,detrend)
Estimate (mean square) coherence of signals "x" and "y".
Use the Welch (1967) periodogram/FFT method.
Compatible with Matlab R11 cohere and earlier.
See "help pwelch" for description of arguments, hints and references — especially hint (7) for Matlab R11 defaults. */
function varargout = cohere(varargin)
if ( nargin<2 )
error( 'cohere: Need at least 2 args. Use help cohere.' );
end
nvarargin = length(varargin);
// remove any pwelch RESULT args and add 'trans'
for iarg=1:nvarargin
arg = varargin(iarg);
if ( ~isempty(arg) && (type(arg)== 10) && ( ~strcmp(arg,'power') || ...
~strcmp(arg,'cross') || ~strcmp(arg,'trans') || ...
~strcmp(arg,'coher') || ~strcmp(arg,'ypower') ))
varargin(iarg) = [];
end
end
varargin(nvarargin+1) = 'coher';
saved_compatib = pwelch('R11-');
if ( nargout==0 )
pwelch(varargin(:));
elseif ( nargout==1 )
Pxx = pwelch(varargin(:));
varargout(1) = Pxx;
elseif ( nargout>=2 )
[Pxx,f] = pwelch(varargin(:));
varargout(1) = Pxx;
varargout(2) = f;
end
pwelch(saved_compatib);
saved_compatib = 0;
endfunction
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